Added temperature to prompt

mealie/services/openai/prompts/recipes/convert-recipe-units.txt

@@ -13,6 +13,7 @@ You will receive whether you should convert from imperial to metric or the other
     - When converting the units you should use units such as liters, ml or cl for liquid ingredients. Example: 100ml of milk, 2l of stock.
     - When converting the units you should use units such as grams, kg or mg for solid ingredients. Example: 10g of salt, 300gr of mozzarella.
     - When converting round up the numbers which make sense depending on the size of the ingredient. For example, if you have 1/3 cup of sugar, you should round it to 70mg of sugar.
+    - You should convert temperature measurements to Celsius. Example: '350°F' should be '180°C'.
     - You should also convert length measurements to measurements like meter, cm and mm. Example: '1/8 inch thick slices' should be '3mm thick slices'.
     - You need to convert units and measurements which are in the notes field.
     - Teaspoons and pinches you can keep the same.